Jason Dere created HIVE-17113:
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Summary: Duplicate bucket files can get written to table by
runaway task
Key: HIVE-17113
URL: https://issues.apache.org/jira/browse/HIVE-17113
Project: Hive
Issue Type: Bug
Components: Query Processor
Reporter: Jason Dere
Assignee: Jason Dere
Saw a table get a duplicate bucket file from a Hive query. It looks like the
following happened:
1. Task attempt A_0 starts,but then stops making progress
2. The job was running with speculative execution on, and task attempt A_1 is
started
3. Task attempt A_1 finishes execution and saves its output to the temp
directory.
5. A task kill is sent to A_0, though this does appear to actually kill A_0
6. The job for the query finishes and Utilities.mvFileToFinalPath() calls
Utilities.removeTempOrDuplicateFiles() to check for duplicate bucket files
7. A_0 (still running) finally finishes and saves its file to the temp
directory. At this point we now have duplicate bucket files - oops!
8. Utilities.removeTempOrDuplicateFiles() moves the temp directory to the final
location, where it is later moved to the partition directory.
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